JP2019162359A5

JP2019162359A5 -

Info

Publication number: JP2019162359A5
Application number: JP2018052917A
Authority: JP
Filing date: 2018-03-20
Publication date: 2021-04-30
Anticipated expiration: 2038-03-20

Description

本発明の一態様による放射線撮影装置は以下の構成を備える。すなわち、
造影剤、ガイドワイヤ、及び、ステントの少なくとも一つが挿入された被写体を透過した互いに異なる放射線エネルギーによる複数の画像を取得する取得手段と、
前記複数の画像を用いてエネルギーサブトラクション処理を行い、エネルギーサブトラクション画像を生成する第１の生成手段と、
過去に生成された複数のエネルギーサブトラクション画像に基づくマスク画像と現在のエネルギーサブトラクション画像に基づくライブ画像との差分画像を生成する第２の生成手段と、を備える。

The radiography apparatus according to one aspect of the present invention has the following configurations. That is,
An acquisition means for acquiring multiple images with different radiation energies transmitted through a subject into which at least one of a contrast agent, a guide wire, and a stent has been inserted.
A first generation means for generating an energy subtraction image by performing energy subtraction processing using the plurality of images, and
A second generation means for generating a difference image between a mask image based on a plurality of energy subtraction images generated in the past and a live image based on the current energy subtraction image is provided.

Claims

An acquisition means for acquiring multiple images with different radiation energies transmitted through a subject into which at least one of a contrast agent, a guide wire, and a stent has been inserted.
A first generation means for generating an energy subtraction image by performing energy subtraction processing using the plurality of images, and
An imaging control device comprising: a second generation means for generating a difference image between a mask image based on a plurality of energy subtraction images generated in the past and a live image based on the current energy subtraction image.

The acquisition means is obtained by irradiating a subject with radiation whose energy changes during one shot and detecting the radiation transmitted through the subject a plurality of times during the one shot, and the plurality of having different energies. The imaging control device according to claim 1, wherein an image is acquired.

The acquisition means is characterized in that the plurality of images are acquired in a shooting period of one frame by performing sampling at least twice with one two-dimensional detector during a period sandwiched between two consecutive resets. The imaging control device according to claim 1.

The first generation means performs energy subtraction processing using the plurality of images to obtain a first energy subtraction image related to the thickness of the first substance and a second energy subtraction image different from the first substance. Generate a second energy subtraction image related to the thickness of the material,
The imaging control device according to any one of claims 1 to 3, wherein the second generation means generates the difference image using the first energy subtraction image.

The imaging control device according to claim 4, wherein the first substance is bone and the second substance is soft tissue.

The first generation means performs energy subtraction processing on the plurality of images, obtains an image of an effective atomic number and an image of a surface density as the energy subtraction image, and obtains the image.
The imaging control device according to any one of claims 1 to 3, wherein the second generation means generates the difference image using the image of the effective atomic number.

The first generation means performs energy subtraction processing using the plurality of images, and acquires an image of an effective atomic number and an image of an area density as the energy subtraction image.
The imaging control device according to claim 1 or 2, wherein the second generation means generates the difference image using the image of the effective atomic number and the image of the surface density.

In the second generation means, the image of the effective atomic number and the mask image generated based on the image of the surface density are ZM and DM, respectively, and based on the image of the effective atomic number and the image of the surface density. When the generated live images are ZL and DL, respectively, DDSA, which is a difference image of surface density, and ZDSA, which is a difference image of execution atomic number, are displayed.

(However, n is a real number of 2.5 or more and 3 or less)
The imaging control device according to claim 7, wherein the photographing control device is generated by.

Claims 1 to 8 include that the second generation means calculates a statistic of a pixel value for each pixel of the plurality of energy subtraction images generated in the past and obtains the pixel value of the mask image. The imaging control device according to any one of the above items.

The imaging control device according to claim 9, wherein the statistic is any one of a minimum value, a maximum value, an average value, and a median value.

The second generation means is characterized in that the mask image is generated by removing an abnormal value for each pixel based on the plurality of energy subtraction images generated in the past. The imaging control device according to any one item.

The second generation means according to any one of claims 1 to 8, wherein the mask image is generated by applying a recursive filter to the plurality of energy subtraction images generated in the past. Shooting control device.

The plurality of images include a first image with a first radiation energy and a second image with a second radiation energy different from the first radiation energy.
The first generation means generates the energy subtraction image from the first image and the second image in consideration of the change in the attenuation rate caused by the change in the values of the pixels constituting the energy subtraction image. The imaging control device according to any one of claims 1 to 12, characterized in that.

The first generation means refers to a two-dimensional table in which pixel values in the energy subtraction image are registered according to the combination of the attenuation rate shown by the first image and the second image. The imaging control device according to claim 13.

It is a radiography control method for radiography equipment,
An acquisition step of acquiring multiple images with different radiation energies transmitted through a subject into which at least one of a contrast agent, a guide wire, and a stent has been inserted.
A first generation step of performing energy subtraction processing using the plurality of images to generate an energy subtraction image, and
A photographing control method comprising: a second generation step of generating a difference image between a mask image based on a plurality of energy subtraction images generated in the past and a live image based on the current energy subtraction image.

The imaging control device according to any one of claims 1 to 14,
Radiation imaging equipment including a two-dimensional detector,
A radiography system characterized by including a radiation generator that generates radiation.

A program for causing a computer to execute each step of the photographing control method according to claim 15.